I couldn't find any information about Kayko revealing which "American Idol" Season 22 contestant should win. It's likely that this information is specific to a social media post or article that isn't readily accessible. If you'd like to know more about a particular contestant, episode, or event, I suggest checking recent news articles, "American Idol" fan sites, or social media platforms. Would you like more general information about "American Idol" Season 22, or is there something else you'd like to discuss?